Method and device for downlink packet access signaling for time division duplex (tdd) mode of a wireless communication system

ABSTRACT

The present invention provides a method, a device and a system for High-Speed Downlink Packet Access (HSDPA) for Time Division Duplex (TDD) mode of a wireless communication system, especially of a Universal Mobile Telecommunication System (UMTS) Terrestrial Radio Access Network (UTRAN) and more particular to a method, a device and a system employing a Paging Indicator Channel (PICH) for signaling High-Speed Downlink Packet Access (HSDPA) for Time Division Duplex (TDD) mode. The structure of Paging Indicator Channel (PICH) is modified to enable a transmission of a High-Speed Indicator (HI) to a certain addressed mobile terminal device initiating the High-Speed Downlink Packet Access (HSDPA).

The present invention related to a method, a device and a system forHigh-Speed Downlink Packet Access (HSDPA) for Time Division Duplex (TDD)mode of a wireless communication system, especially of a UniversalMobile Telecommunication System (UMTS) Terrestrial Radio Access Network(UTRAN). More particular, the present invention relates to a method, adevice and a system employing a Paging Indicator Channel (PICH) forsignaling High-Speed Downlink Packet Access (HSDPA) for Time DivisionDuplex (TDD) mode.

The 3^(rd) Generation Partnership Project (3GPP) currently discussesmethods for downlink signaling of Universal Mobile TelecommunicationSystem (UMTS) Terrestrial radio access network (UTRAN) High-SpeedDownlink Packet Access (HSDPA) for Time Division Duplex (TDD) mode.

For dedicated (transport) Channel (DCH) associated two-step signaling,the associated dedicated channel (DCH) and High-Speed Shared ControlChannel (HS-SCCH) are needed for each mobile terminal device employinghigh-speed downlink services to transmit downlink signaling information.The Dedicated Channel (DCH) carries High-Speed Indicator (HI) bits usedto indicate or designate a mobile terminal device to receive downlinksignaling information on the High-Speed Shared Control Channel(HS-SCCH). This High-Speed Shared Control Channel (HS-SCCH) carries datacomprising a mobile terminal device identification (UE ID), TransportFormat Resource Indicator (TFRI), Hybrid Automatic Repeat Request (HARQ)mode and further signaling information for the mobile terminal device.These signaling information carried on the High-Speed Shared ControlChannel (HS-SCCH) may be employed for receiving and decoding the packetdata transmitted through the Downlink Shared Channel (DSCH).

This method for signaling High-Speed Downlink Packet Access (HSDPA) forTime Division Duplex (TDD) mode includes several disadvantages.

Each mobile terminal device employing High-Speed Downlink Packet Access(HSDPA) should have one associated Dedicated Channel (DCH) to transmitHigh-Speed Indicator (HI) bits. The number of Dedicated Channel (DCH)supported by the system will be matching the number of mobile terminaldevices employing High-Speed Downlink Packet Access (HSDPA). Since theseassociated Dedicated Channels (DCH) are exclusively involved to carryHigh-Speed Indicator (HI) information comprising a few single bits (forexample one or two bits) resources are not efficiently used and overallperformance is wasted.

Further, the associated Dedicated Channel (DCH) is shared in the timedomain upon the mobile terminal devices employing High-Speed DownlinkPacket Access (HSDPA). A packet scheduler controlling the sequence intime of the associated Dedicated Channel (DCH) may have to berescheduled if a mobile terminal device employing High-Speed DownlinkPacket Access (HSDPA) exits and/or accesses the network for sharing theDedicated Channel (DCH) in the time domain in Time Division Duplex (TDD)mode. The rescheduling is time consuming and lacks of flexibility incase of fast changing conditions, particularly in case of a high numberof exiting mobile terminal devices employing High-Speed Downlink PacketAccess (HSDPA).

The present invention offers a new approach for sending High-SpeedIndicator (HI) information in the downlink signaling of High-SpeedDownlink Packet Access (HSDPA) for Time Division Duplex (TDD) mode,particular for Universal Mobile Telecommunication System (UMTS)Terrestrial radio access network (UTRAN). The present invention aims toovercome the above described disadvantages of the method of state of theart. The basic idea of the present invention resides in that reservedand currently unused bits on the Paging Indicator Channel (PICH) areused to transmit High-Speed Indicator (HI) information to indicate amobile terminal device to receive and decode signaling information onthe High-Speed Shared Control Channel (HS-SCCH).

The usage of the Paging Indicator Channel (PICH) and the reserved bitsthereon offers the possibility to establish a High-Speed Downlink PacketAccess (HSDPA) without involving associated the Dedicated Channel (DCH)for each mobile terminal device employing the access service and thussaving Dedicated Channel (DCH) resources. Further, the implementation ofa scheduler controlling the High-Speed Downlink Packet Access (HSDPA)and signaling thereof may be easier. Different coding of the reservedbits of the Paging Indicator Channel (PICH) used for signaling may offeradditional flexibility since the coding may allow different mapping withrespect to the configuration of the system. Moreover, the PagingIndicator Channel (PICH) is transmitted with high power. The high powertransmission ensures that all mobile terminal devices within a cell mayreceive an adequate signal for decoding.

According to a first aspect of the present invention, a High-SpeedDownlink Packet Access (HSDPA) for Time Division Duplex (TDD) mode of awireless communication system, preferably of a Universal MobileTelecommunication System (UMTS) and more preferably of a UniversalMobile Telecommunication System (UMTS) Terrestrial Radio Access Network(UTRAN) based on the usage of a Paging Indicator Channel is provided.The sender, i.e. a base station (node B) first sends indicationinformation to a mobile terminal device (UE). The mobile terminal device(UE) identified by the said indication information further receivessignaling information. Said mobile terminal device then, based on saidsignaling information, decodes packet data information. The invention ischaracterized by including a High-Speed Indicator (HI) into the slotstructure of the Paging Indicator Channel (PICH). Therefore, theHigh-Speed Indicator (HI) comprises a plurality of identification bits.The identification bits are assigned to certain values.

The High-Speed Indicator (HI) is used to determine a specific mobileterminal device out of a plurality of mobile terminal devices. Themobile terminal device may be a participant of the corresponding mobilecommunication network and the High-Speed Downlink Packet Access (HSDPA)service provided by a sender. The sender may be a Base Station (BS) of aUniversal Mobile Telecommunication System (IMTS), preferably a Node BBase Station (BS). The determined mobile terminal device is accessiblein a downlink channel.

Conveniently, the High-Speed Indicator (HI) comprising identificationbits may define an identification address. The address may be coded indifferent ways.

Preferably, the plurality of identification bits are four identificationbits. The identification bits may be arranged adjacent to a midamble ofthe Paging Indicator Channel according to the slot structure thereof.The identification bits may be in groups in two pairs each comprisingtwo bits. The pairs are arranged on either side of the midamble.

Additionally, a plurality of mobile terminal devices may be divided upona plurality groups and assigned thereto. Each group may comprise severalmobile terminal devices. The dividing of the mobile terminal devicesupon several groups may be dynamical which means that mobile terminaldevices may exit and/or access a group. The dividing upon groups may berearranged according to certain operational conditions.

Preferably, each group may have assigned periods of time. Within theassigned periods of time certain services may be offered to the mobileterminal devices of the group and these mobile terminal devices may haveto listen on certain channels in order to be able to receive informationand/or data which are destined to one or more mobile terminal devices ofthe group. Mobile terminal devices of the remaining groups do not haveto listen to the corresponding channels since the services are providedto the first mobile terminal devices.

The assigning of the groups to certain periods of time may instruct themobile terminal devices of the groups only to listen, receive and decodeinformation transmitted on the Paging Indicator Channel (PICH) withinthe assigned periods. Further, the assigning of the groups to certainperiods of time may Instruct the mobile terminal devices of the groupsonly to listen, receive and decode information transmitted on theHigh-Speed Shared Control Channel (HS-SCCH) within the assigned periodsof time and/or the assigning of the groups to certain periods of timemay instruct the mobile terminal devices of the groups only to listen,receive and decode information transmitted on the Downlink SharedChannel (DSCH) within the assigned periods of time.

An address coded in the High-Speed Indicator using the identificationbits may be used to code an address of the mobile terminal device whichis preferably unique within a group. Addresses of mobile terminaldevices assigned to different groups may be equal.

The periods of time assigned to a group may be periodical.Correspondingly, a repetition time may be assigned to each group and maydefine the respective periods of time for the groups. The repetitiontime of the groups may vary analog to the periods of time describedabove. The repetition time may be a static repetition time or a dynamicrepetition time. The dynamic repetition time may be adapted to trafficload. A static repetition time may be assigned to each group whiledividing the plurality of mobile terminal devices upon the plurality ofgroups. Further, accessing and exiting mobile terminal devices of thegroups may make an adaptation of the repetition time necessary.

A mobile terminal device may receive information on the Paging IndicatorChannel (PICH) including said identification bits. The receiving ofidentification bits included in the Paging Indicator Channel (PICH) mayindicate a following transmission of high-speed downlink packets. Theidentification bits representing an address of a mobile terminal devicemay have to match to an address assigned to a mobile terminal device,wherein the address of the mobile terminal device may be coded accordingto the coding of the address with respect to the identification bits.

A mobile terminal device may receive signaling information on aHigh-Speed Shared Control Channel (HS-SCCH). Preferably, the mobileterminal device may also receive a High-Speed Indicator (HI) on thePaging Indicator Channel (PICH) and the High-Speed Indicator (HI)comprises an address coded by the identification bits, determining thereceiving mobile terminal device.

More preferably, the High-Speed Indicator (HI) comprises an addressdetermining a mobile terminal device and instructing this mobileterminal device to receive and decode signaling information transmittedon a High-Speed Shared Control Channel (HS-SCCH).

Additionally, the High-Speed Shared Control Channel (HS-SCCH) maycomprise mobile terminal device identification (user identification orUE ID), Transport Format and Resource related Information (TFRI), HybridAutomatic Repeat Request (HARQ) information, Uplink Synchronizationinformation and Transport Power Control (TPC) information.

A mobile terminal device may receive and decode data packets on aDownlink Shared Channel (DSCH). The signaling information received onthe High-Speed Shared Control Channel HS-SCCH) before may be employedfor receiving and decoding of the data packets. Especially thetransmission related information comprised in the signaling informationtransmitted on a High-Speed Shared Control Channel (HS-SCCH) may beemployed for decoding.

The mobile terminal device may transmit a transmission relatedinformation. Preferably, the mobile terminal device may transmittransmission related information on a High-Speed Information Channel(HICH). The transmission related information may comprise anacknowledgement/non acknowledgement (ACK/NAK) indicating if thetransmission on the Downlink Shared Channel (DSCH) may have beenreceived and decoded correctly or erroneously. Further, the transmissionrelated information may also comprise a quality indicator and aTransport Power Control (TPC).

The identification bits may be used to code an address of a mobileterminal device, preferably of a mobile terminal device within a group.

Preferably, the address coding may be based on a binary coding. Sincefour identification bits may be reserved for coding the address thebinary coding may enable to code 2⁴=16 different addresses. Certainaddresses, such as 0000₂ and 1111₂ may be dedicated to specialfunctions, wherein the index 2 may denote the binary coding. Forexample, the address 0000₂ may indicate that no mobile terminal deviceis addressed and the address 1111₂ may indicate that all mobile terminaldevices are addressed. Each mobile terminal device of a group may haveassigned a unique address.

Moreover, the address coding may be based on a logic coding. Each bitmay be assigned to a corresponding mobile terminal device. Since a bitmay represent two different states the logic one state, e.g. the state“1” may indicate that the corresponding mobile terminal device isaddressed whereas the state “0” may indicate that the correspondingmobile terminal device is not addressed. Address coding may enable toaddress a selection of mobile terminal devices at the same time. Thefour identification bits may allow to address four mobile terminaldevices according to the logic address coding.

The grouping of the mobile terminal devices into different groups may bebased on the data traffic generated by the mobile terminal devices.Further, the grouping of the mobile terminal devices into differentgroups may be based on N channel Hybrid Automatic Repeat Request (HARQ)scheme.

According to a second aspect of the present invention, a computerprogram for carrying out the method for High-Speed Downlink PacketAccess (HSDPA) for Time Division Duplex (TDD) mode of a wirelesscommunication system is provided, which comprises program code means forperforming all of the steps of the preceding method description when theprogram is run on a computer, a network device, a mobile terminal deviceor an application specific integrated circuit.

According to a third aspect of the present invention, a computer programproduct is provided comprising program code means stored on a computerreadable medium for carrying out the method for High-Speed DownlinkPacket Access (HSDPA) for Time Division Duplex (TDD) mode of a wirelesscommunication system of the preceding description, when the computerprogram product is run on a computer, a network device, a mobileterminal device or an application specific integrated circuit.

According to a fourth aspect of the present invention, a mobile terminaldevice for the High-Speed Downlink Packet Access (HSDPA) for TimeDivision Duplex (TDD) mode of a wireless communication system isprovided, which is adapted to perform a method for the High-SpeedDownlink Packet Access (HSDPA) for Time Division Duplex (TDD) mode of awireless communication system as described in the aforementioneddescription. The mobile terminal device can be a computer, a networkdevice or a mobile terminal device such as a mobile phone.

Preferably, the mobile terminal device may comprise means for decodinginformation transmitted on the Paging Indicator Channel (PICH) whichenables to extract the included identification bits determining aspecific mobile terminal device. An address corresponding to the codingof the identification bits may be assigned to the mobile terminaldevice. The address coding is described above in detail. In case ofmatching received signaling information transmitted on a High-SpeedShared Control Channel (HS-SCCH) may be employed to receive and decodedata packet on a Downlink Shared Channel (DSCH).

The mobile terminal device may be assigned to a certain group accordingto the above described dividing of a plurality of mobile terminaldevices upon a plurality of groups.

According to a fifth aspect of the present invention, a wirelesscommunication system for the High-Speed Downlink Packet Access (HSDPA)for Time Division Duplex (TDD) mode is provided, which is adapted toperform a method for the High-Speed Downlink Packet Access (HSDPA) forTime Division Duplex (TDD) mode of a wireless communication system asdescribed in the aforementioned description.

The wireless communication system may comprise a plurality of mobileterminal devices for the High-Speed Downlink Packet Access (HSDPA) forTime Division Duplex (TDD) mode described above in detail. Further asender comprised by the wireless communication system may generate asignal according to the signal structure of the Paging Indicator Channel(PICH) comprising identification bits using an adequate generatingmeans. The identification bits may be a High-Speed Indicator (HI)determining a specific one of the plurality of mobile terminal devices.The Paging Indicator Channel (PICH) may be transmitted to a plurality ofmobile terminal devices. The plurality of mobile terminal devices may begrouped according to the aforementioned grouping procedure.

Moreover, the wireless communication system may also provide andtransmit signaling information on a High-Speed Shared Control Channel(HS-SCCH) and/or data packets on a Downlink Shared Channel (DSCH).Corresponding means for generating and transmitting of correspondingradio signals may preferably provided by a sender of the mobilecommunication system.

Additionally, the sender may also provide means to divide or group aplurality of mobile terminal devices, respectively, to assign addressesaccording to the coding of the identification bits of the High-SpeedIndicator and to assign periods of time for accessing for the groupedmobile terminal devices to the mobile communication network. The meansfor dividing or grouping, respectively and for assigning addresses andperiods of time may be operated according to the above describedoperational procedures for dividing or grouping, respectively and forassigning addresses and periods of time.

In the following, the invention will be described in detail by referringto the enclosed drawing in which:

FIG. 1 shows a slot structure of a Paging Indicator Channel (PICH)according to an embodiment of the invention.

FIG. 2 shows a grouping of a plurality of mobile communication terminalsaccording to an embodiment of the invention.

FIG. 3 shows frame diagram of a high data transmitting situationaccording to an embodiment of the invention.

FIG. 1 shows a slot structure of a Paging Indicator Channel (PICH)according to an embodiment of the invention. The shown slot structuredepicts a Paging Indicator Channel (PICH) burst with respect to the 3GPP(3^(rd) Generation Partnership Project) and the number of bits and theirarrangement within the burst structure.

The communication of data via a time duplex division (TDD) radiofrequency communication system between a plurality of communicationmembers such as base stations and mobile communication terminal is basedon time slotted transmission structure within the time domain whereuponthe certain periods of time are dedicated and assigned for thecommunication of a certain member of the time duplex division (TDD)radio frequency communication system. According to a standard defined bythe 3GPP (3^(rd) Generation Partnership Project) a time duplex division(TDD) radio communication system, especially time duplex division (TDD)based universal mobile telecommunication services terrestrial radioaccess network (UTRAN), the time structure of a time duplex divisionradio communication network may be described by radio frames and timeslots, wherein each radio frame comprises a plurality of time slots.According to the 3GPP standard definition each time division multipleaccess (TDMA) frame has duration of 10 ms and is subdivided into fifteentime slots (TS), whereas each time slot may be further subdivided into2560.

The time slots may be allocated to either an uplink or a downlinktransmission between a mobile terminal device and a base station. Thetime slot may be allocated completely to one of the transmissiondirection so that a frame may comprise an arbitrary sequence of uplinkand downlink transmissions. The 2560 chips of a time slot may beprimarily used for coding or spreading the communicated data within atime slot, respectively. The spreading of communicated data within atime slot is out of the scope of this invention and known to thoseskilled in the art and described in available standard documents of the3^(rd) Generation Partnership Project (3GPP).

A burst of data may be designated as a physical channel of a timedivision duplex radio communication system. A burst may be transmittedin a time slot within an allocated frame and its duration is one timeslot. Each burst may include a first data part, a midamble, a seconddata part and a guard part. Different type of burst may be available fordata communication, particularly a type 1, type 2 and type 3, whereinthe both burst types 1 and 2 may be employed for uplink and downlinkdata communication whereas burst type 3 may be employed exclusively foruplink data transmission. Type 2 burst may be distinguished by a largerdata amount in comparison with type 1 burst. At maximum, a type 1 burstmay comprise 1952 symbols of data (or bits, respectively) at spreadfactor 1 (SF 1) whereas a type 2 burst may comprise 2208 symbols of data(or bits, respectively) at spread factor 1. Correspondingly, at a spreadfactor 16 (SF 16) the burst may comprise 122 or 138 symbols of data,respectively.

The midamble may comprise training sequences. Since the total length ofa burst may be defined by a time slot the training sequence or midambleof a type 1 burst comprises a training sequence of more data symbolsthan a type 2 burst. The guard period of both the type 1 and type 2burst may comprise the same number of data symbols.

The Paging Indicator Channel (PICH) indicates or designates a mobileterminal device for which it is provided that a Paging Message might beaccepted thereby on the Paging Channel (PCH). The mobile terminaldevices may be assigned to a paging group when it is registered with thenetwork. These paging groups may be indicated by the use of PagingIndicators (PI) carried on the Paging Indicator Channel (PICH).

Two different burst types, type 1 and type 2, are employed for definingdifferent numbers of bits N_(pib) or number of data symbols within thestructure, respectively. The burst type 1 may carry a Paging Indicator(PI) with a number of bits N_(pib)=240, whereas the burst type 2 maycarry another Paging Indicator (PI) with a number of bits N_(pib)=272.The bits s_(NPIB+1), . . . , s_(NPIB+4) adjacent to the midamble arereserved up to now for future usage. The usage of the remaining bits s₁,. . . , s_(NPIB) are defined by the 3GPP standard.

These four reserved bits s_(NPIB+1), . . . , s_(NPIB+4) may be used foraddressing an individual mobile terminal device out of a group of mobileterminal devices and indicating to the mobile terminal device to receivea high-speed downlink packet. Therefore, the four reserved bits may bedesignated in the following description as an address or a High-SpeedIndicator (HI). Two different coding may be employed for enabling anaddressing of a mobile terminal device.

A first address coding may be based on a binary coding of an individualaddress of each mobile terminal device out of the group of mobileterminal devices. The first address coding may be based on a binarycoding of the addresses. This coding method may be employed in case ofone device which may be allowed to transmit high-speed downlink packetsin each frame. The employed four bits for coding an individual addressof a mobile terminal device may allow to assign 2⁴=16 differentaddresses for addressing. In the following binary coded numbers andhence also the binary coded addresses may be indicated by a subscript“2”, whereas the respective decimal spelling is indicated by a subscript“10”. In the following description of this invention the states of thefour bits may be denoted enclosed within quotation marks, such as“0010”.

The addresses 0000₂=0₁₀, 1111₂=15₁₀ may be reserved for specialaddressing operations and not assigned to any certain mobile terminaldevice. The address 0000₂=0₁₀ may indicate that no one of the mobileterminal devices of the group thereof may is addressed, whereas theaddress 1111₂=15₁₀ may indicate that all mobile terminal devices of thegroup thereof may be addressed.

Thus, fourteen remaining addresses may be used for addressing individualmobile terminal devices when the both addresses 0000₂=0₁₀, 1111₂=15₁₀may be employed for the above described special operations. Theremaining addresses 0001₂=1₁₀, 0010₂=2₁₀, 0011₂=3₁₀, . . . , 1110₂=14₁₀may allow to address maximum fourteen different mobile terminal devicesand may be assigned correspondingly thereto.

A second address coding may be based on a non binary coding ofaddresses. Each bit of the reserved four identification bits may beassigned to a certain mobile terminal device for addressing. This codingmethod may be employed advantageously in case of several devices whichmay be allowed to transmit high-speed packet data in each frame.Therefore, it may be possible to address four different mobile terminaldevices and hence, the group of mobile terminal devices may comprisemaximal four different mobile terminal devices. Each bit may offer twodifferent bits states, a bit state “1” and a bit state “0”,respectively.

The address “1000” may indicate that, for example, the first mobileterminal device out of the group of the four mobile terminal devices maybe addressed, whereas the remaining three mobile terminal devices(second, third and fourth) may be not addressed. Correspondinglyfurther, the address “0100” may indicate that, for example, the secondmobile terminal device out of the group of the four mobile terminaldevices may be addressed, whereas the remaining three mobile terminaldevices (first, third and fourth) may be not addressed. Correspondinglyfurther, the address “0010” may indicate that, for example, the thirdmobile terminal device out of the group of the four mobile terminaldevices may be addressed, whereas the remaining three mobile terminaldevices (first, second and fourth) may be not addressed. Correspondinglyfurther, the address “0001” may indicate that, for example, the fourthmobile terminal device out of the group of the four mobile terminaldevices may be addressed, whereas the remaining three mobile terminaldevices (first, second and third) may be not addressed.

This second address coding allows to address a selected subgroup out ofthe group of four mobile terminal devices. For example, the addresscoding “1001” may indicate that, for example, the first and fourthmobile terminal devices are addressed whereas the second and the thirdmobile terminal devices are not addressed. For example, the addresscoding “1011” may indicate that, for example, the first, third andfourth mobile terminal devices are addressed whereas the second mobileterminal device is not addressed.

The usage and functionality connected to the addresses “0000” and “1111”is the same like described in combination with the first address codingprocedure. A coded address “0000” may indicate that no one of the mobileterminal devices is addressed to initiate a data transmission.Correspondingly, an address “1111” may indicate an initialization of adata transmission to all four mobile terminal devices of the group.

In the following description, the address coding of the mobile terminaldevices may be based on the first address coding mentioned and describedabove. The below presented description may be employed in a similarmanner in combination with the above mentioned second address coding.

FIG. 2 shows a grouping of a plurality of mobile communication terminalaccording to an embodiment of the invention. A plurality of mobileterminal devices is shown in FIG. 2. The mobile terminal devices aregrouped in five separate groups each comprising a subset of plurality ofmobile terminal devices. The grouping and the number of mobile terminaldevices within the different groups is exemplary and the grouping mayperformed in another arrangement. Since the address coding is based onthe first address coding procedure the different groups may comprisemaximal fourteen mobile terminal devices. Further, the number of groupsmay also be exemplary and not limited to the depicted five differentgroups.

A first group designated as group 1 may comprise exemplary four mobileterminal devices and the mobile terminal devices may be designated as UE1, UE 2, UE 3 and UE 4, respectively. According to the address codingprocedure, the addresses “0001”, “0010”, “0011” and “0100” may beassigned to the corresponding mobile terminal devices UE 1, UE 2, UE 3and UE 4.

A second group designated as group 2 may comprise exemplary six mobileterminal devices and the mobile terminal devices may be designated as UE5, UE 6, UE 7, UE 8, UE 9 and UE 10, respectively. According to theaddress coding procedure, the addresses “0001”, “0010”, “0011” “0100”“0101” and “0110” may be assigned to the corresponding mobile terminaldevices UE 5, UE 6, UE 7, UE 8, UE 9 and UE 10.

A third group designated as group 3 may comprise exemplary three mobileterminal devices and the mobile terminal devices may be designated as UE11, UE 12 and UE 13, respectively. According to the address codingprocedure, the addresses “0001”, “0010” and “0011” may be assigned tothe corresponding mobile terminal devices UE 11, UE 12 and UE 13.

A fourth group designated as group 4 may comprise exemplary six mobileterminal devices and the mobile terminal devices may be designated as UE14, UE 15, UE 16, UE 17, UE 18 and UE 19, respectively. According to theaddress coding procedure, the addresses “0001”, “0010”, “0011” “0100”“0101” and “0111” may be assigned to the corresponding mobile terminaldevices UE 14, UE 15, UE 16, UE 17, UE 18 and UE 19.

A fifth group designated as group 5 may comprise exemplary four mobileterminal devices and the mobile terminal devices may be designated as UE20, UE 21, UE 22, UE 23 and UE 24, respectively. According to theaddress coding procedure, the addresses “0001”, “0010”, “0011”, “0100”and “0101” may be assigned to the corresponding mobile terminal devicesUE 20, UE 21, UE 22, UE 23 and UE 24.

The plurality of mobile terminal devices are divided into a pluralitygroups. The number of groups may and the division thereupon may beperformed dynamically or statically. For example, the grouping(arrangement and/or number of groups) may be based on traffic load or Nchannel Hybrid Automatic Repeat Request (HARQ) scheme.

The following FIG. 3 may represent a time flow diagram according to anembodiment of the method of the present invention. The time flow diagramis based on the grouping presented above according to FIG. 2.

FIG. 3 shows frame diagram of a high data transmitting situationaccording to an embodiment of the invention. The five groups eachcomprising mobile terminal devices, shown in FIG. 2 may listen to thePaging Indicator Channel (PICH). According to this embodiment of theinvention, the mobile terminal devices of one group may listen to thePaging Indicator Channel (PICH) every fifth frame. Correspondingly,group 1 may listen to frame 1, group 2 to frame 2, group 3 to frame 3,group 4 to frame 4 and group 5 to frame 5. Beginning with frame 6 group1 may listen again thereto and further group 2 may follow in listeningto frame 7. This sequencing of the groups may be continued. Analog tothe grouping of the mobile terminal devices, the period of repetitionmay be defined both dynamically or statically. For example, the periodof repetition may be based on traffic load or N channel Hybrid AutomaticRepeat Request (HARQ) scheme. Further, the groups may have the sameperiods of repetition.

The following channels may be involved in and used by the embodiment ofthe present invention. A short describing introduction of the channelswill be given since the complete definition of the respective channelsmay be known to those skilled in the art.

The Paging Indicator Channel (PICH) may indicate to a mobile terminaldevice that a Paging Message might be expected thereby on the PagingChannel (PCH). The mobile terminal devices may be assigned to a paginggroup when it is registered with the network. These paging groups may beindicated by the use of Paging Indicators (PI) carried on the PagingIndicator Channel (PICH). Here in the invention, the reserved bits as inFIG. 1 are used as High Speed Indicator (HI) which comprise the codedaddress of a mobile terminal device of the respective group forinitialing a high-speed downlink transmission.

The High-Speed Shared Control Channel (HS-SCCH) may be used to carryindicator and signaling information to be employed for receiving anddecoding information transmitted through a Downlink Shared Channel(DSCH).

The Downlink Shared Channel (DSCH) is used to carry dedicated user dataor control signal to one or more mobile terminal devices in acommunication cell. The decoding of the dedicated user data or controlsignal may be enabled and controlled by information transmitted via theabove mentioned High-Speed Shared Control Channel (HS-SCCH).

The Uplink High-Speed Downlink Packet Access (HSDPA) Information ChannelUL-HICH) may be used to carry indicator and signaling information to abase station or Node B, respectively. Three different fields may becomprised, an acknowledge/negative acknowledge (ACK/NAK) field, aQuality Indicator field and a Transmit Power Control (TPC) field.

Each mobile terminal device of a corresponding group according to aspecific frame assigned to the corresponding group may listen to thePaging Indicator Channel (PICH) of this frame while the mobile terminaldevice of the other groups do not listen. Further, the mobile terminaldevice of this group may share the Downlink Shared Channel (DSCH).

In the following, the time sequence provided in FIG. 3 will be describedwith respect to each single frame.

In a frame 1, all mobile terminal devices comprised by the group 1 maylisten to the Paging Indicator Channel (PICH). An address of a mobileterminal device out of group 1 may be comprised in the high speedindicator (HI) carried by the Paging Indicator Channel (PICH) andreceived by the mobile terminal devices of group 1. The address “0001”may be coded in the High speed indicator (HI) according to the abovedescribed first coding procedure (shown in FIG. 1). The mobile terminaldevice UE 1 which may have been assigned the address “0001” decodes itsaddress and hence may be indicated to receive and decode the downlinksignaling information which may be transmitted through and obtained onthe High-Speed Shared Control Channel (HS-SCCH). The downlink signalinginformation may enable the mobile terminal device to receive and decodethe high-speed packet data in the Downlink Shared Channel (DSCH) byusing this received and decoded downlink signaling information. Aconfirmation may be transmitted to the high-speed downlink packetsender, such as a Node B. The confirmation may comprise anacknowledge/negative acknowledge (ACK/NAK) and measurement report.Preferably the confirmation may be transmitted via the Uplink High-SpeedDownlink Packet Access (HSDPA) Information Channel (UL-HICH) carryingthe above described information.

The operations of the following frames are carried out analog to theoperations described with respect to frame 1.

In a frame 2, the mobile terminal devices of group 2 may listen to thePaging Indicator Channel (PICH) which may transmit an address of amobile terminal device “0101” corresponding to mobile terminal device UE9 of group 2. The mobile terminal device UE 9 which may have beenassigned the address “0101” decodes its address and hence may beindicated to receive and decode the downlink signaling information whichmay be transmitted through and obtained on the High-Speed Shared ControlChannel (HS-SCCH). The downlink signaling information may enable themobile terminal device to receive and decode the high-speed packet datain the Downlink Shared Channel (DSCH) by using this received and decodeddownlink signaling information. A confirmation may be transmitted to thehigh-speed downlink packet sender, such as a Node B. The confirmationmay comprise an acknowledge/negative acknowledge (ACK/NAK) andmeasurement report and preferably transmitted via the Uplink High-SpeedDownlink Packet Access (HSDPA) Information Channel (UL-HICH).

In a frame 3, the mobile terminal devices of group 3 may listen to thePaging Indicator Channel (PICH) which may transmit an address of amobile terminal device “0010” corresponding to mobile terminal device UE12 of group 3. The mobile terminal device UE 12 which may have beenassigned the address “0010” decodes its address and hence may beindicated to receive and decode the downlink signaling information whichmay be transmitted through and obtained on the High-Speed Shared ControlChannel (HS-SCCH). The downlink signaling information may enable themobile terminal device to receive and decode the high-speed packet datain the Downlink Shared Channel (DSCH) by using this received and decodeddownlink signaling information. A confirmation may be transmitted to thehigh-speed downlink packet sender, such as a Node B. The confirmationmay comprise an acknowledge/negative acknowledge (ACK/NAK) andmeasurement report and preferably transmitted via the Uplink High-SpeedDownlink Packet Access (HSDPA) information Channel (UL-HICH).

In a frame 4, the mobile terminal devices of group 4 may listen to thePaging Indicator Channel (PICH) which may transmit an address of amobile terminal device “0010” corresponding to mobile terminal device UE15 of group 4. The mobile terminal device UE 15 which may have beenassigned the address “0010” decodes its address and hence may beindicated to receive and decode the downlink signaling information whichmay be transmitted through and obtained on the High-Speed Shared ControlChannel (HS-SCCH). The downlink signaling information may enable themobile terminal device to receive and decode the high-speed packet datain the Downlink Shared Channel (DSCH) by using this received and decodeddownlink signaling information. A conformation may be transmitted to thehigh-speed downlink packet sender, such as a Node B. The confirmationmay comprise an acknowledge/negative acknowledge (ACK/NAK) andmeasurement report and preferably transmitted via the Uplink High-SpeedDownlink Packet Access (HSDPA) Information Channel (UL-HICH).

In a frame 5, the mobile terminal devices of group 5 may listen to thePaging Indicator Channel (PICH) which may transmit an address of amobile terminal device “0100” corresponding to mobile terminal device UE23 of group 5. The mobile terminal device UE 23 which may have beenassigned the address “0100” decodes its address and hence may beindicated to receive and decode the downlink signaling information whichmay be transmitted through and obtained on the High-Speed Shared ControlChannel (HS-SCCH). The downlink signaling information may enable themobile terminal device to receive and decode the high-speed packet datain the Downlink Shared Channel (DSCH) by using this received and decodeddownlink signaling information. A confirmation may be transmitted to thehigh-speed downlink packet sender, such as a Node B. The confirmationmay comprise an acknowledge/negative acknowledge (ACK/NAK) andmeasurement report and preferably transmitted via the Uplink High-SpeedDownlink Packet Access (HSDPA) Information Channel (UL-HICH).

In a frame 6, the mobile terminal devices of group 1 may listen to thePaging Indicator Channel (PICH) which may transmit an address of amobile terminal device “0011” corresponding to mobile terminal device UE3 of group 1. The mobile terminal device UE 3 which may have beenassigned the address “0011” decodes its address and hence may beindicated to receive and decode the downlink signaling information whichmay be transmitted through and obtained on the High-Speed Shared ControlChannel (HS-SCCH). The downlink signaling information may enable themobile terminal device to receive and decode the high-speed packet datain the Downlink Shared Channel (DSCH) by using this received and decodeddownlink signaling information. A confirmation may be transmitted to thehigh-speed downlink packet sender, such as a Node B. The confirmationmay comprise an acknowledge/negative acknowledge (ACK/NAK) andmeasurement report and preferably transmitted via the Uplink High-SpeedDownlink Packet Access (HSDPA) Information Channel (UL-HICH).

In a frame 7, the mobile terminal devices of group 2 may listen to thePaging Indicator Channel RICH) which may transmit an address of a mobileterminal device “0010” corresponding to mobile terminal device UE 6 ofgroup 2. The mobile terminal device UE 6 which may have been assignedthe address “0010” decodes its address and hence may be indicated toreceive and decode the downlink signaling information which may betransmitted through and obtained on the High-Speed Shared ControlChannel (HS-SCCH). The downlink signaling information may enable themobile terminal device to receive and decode the high-speed packet datain the Downlink Shared Channel (DSCH) by using this received and decodeddownlink signaling information. A confirmation may be transmitted to thehigh-speed downlink packet sender, such as a Node B. The confirmationmay comprise an acknowledge/negative acknowledge (ACK/NAK) andmeasurement report and preferably transmitted via the Uplink High-SpeedDownlink Packet Access (HSDPA) Information Channel (UL-HICH).

This specification contains the description of implementations andembodiments of the present invention with the help of examples. It willbe appreciated by a person skilled in the art, that the presentinvention is not restricted to details of the embodiments presentedabove, and that the invention can be also implemented in another formwithout deviating from the characteristics of the invention. Theembodiment presented above should be considered as illustrative, but notrestricting. Thus, the possibilities of implementing and using theinvention are only restricted to the enclosed claims.

1. A method for High-Speed Downlink Packet Access signaling for TimeDivision Duplex mode of a wireless communication system, comprising thefollowing steps: a base station sending indication information to amobile terminal device (UE); the mobile terminal device (UE) identifiedby the said indication information receiving signaling information; saidmobile terminal device, based on the said signaling information,decoding packet data information; wherein a High-Speed Indicatordesignates a specific mobile terminal device accessible in a downlinkchannel, characterized by the steps of: including said High-SpeedIndicator into the slot structure of a Paging Indicator Channel (PICH),said High-Speed Indicator comprising a plurality of identification bits,each identification bit being assigned.
 2. A method according to claim1, wherein said plurality of identification bits are four identificationbits arranged in two pairs each of two bits on either side of andadjacent to a midamble area of said Paging Indicator Channel (PICH). 3.A method according to any one of the preceding claims claim 1,comprising the following further step: dividing a plurality of mobileterminal devices upon a plurality of groups.
 4. A method according toclaim 3, comprising the following further step: assigning certainperiods of time to each group, wherein each mobile terminal device of agroup receives data transmitted within said periods of time assigned tosaid respective group via said Paging Indicator Channel (PICH).
 5. Amethod according to claim 3, comprising the following further step:assigning a High-Speed Indicator to each mobile terminal device of agroup.
 6. A method according to claim 4, wherein said periods of time ofa group are assigned according to the data traffic of the group.
 7. Amethod according to claim 1, comprising the following further step:receiving information on said Paging Indicator Channel (PICH) by amobile terminal device.
 8. A method according to claim 1, comprising thefollowing further step: receiving signaling information on a High-SpeedShared Control Channel (HS-SCCH) by a mobile terminal device.
 9. Amethod according to claim 7, comprising the following further step:receiving and decoding data packets on a Downlink Shared Channel (DSCH)by a mobile terminal device, wherein the receiving and decoding stepemploys said signaling information received on said High-Speed SharedControl Channel (HS-SCCH).
 10. A method according to claim 1, comprisingthe following further step: transmitting transmission relatedinformation.
 11. A method according to claim 1, wherein saididentification bits code a binary address of a mobile terminal device.12. A method according to claim 1, wherein said identification bits codea logical address of a mobile terminal device.
 13. A method according toclaim 3, wherein said dividing a plurality of mobile terminal devicesupon a plurality of groups is based on the data traffic.
 14. A methodaccording to claim 3, wherein said dividing a plurality of mobileterminal devices upon a plurality of groups is based on an N channelHybrid Automatic Repeat Request scheme.
 15. A computer program forexecuting a method for High-Speed Downlink Packet Access for TimeDivision Duplex mode of a wireless communication system, comprisingprogram code means for carrying out each of the steps of claim 1 whensaid program is run on a computer, a network device, a mobile device, oran application specific integrated circuit.
 16. A computer programproduct comprising program code means stored on a computer readablemedium for carrying out each of the steps of the method for High-SpeedDownlink Packet Access for Time Division Duplex mode of a wirelesscommunication system of claim 1 when said program product is run on acomputer, a network device, a mobile device, or an application specificintegrated circuit.
 17. A mobile terminal device for High-Speed DownlinkPacket Access for Time Division Duplex mode of a wireless communicationsystem, comprising means adapted to perform each of the steps of themethod for High-Speed Downlink Packet Access for Time Division Duplexmode of a wireless communication system according to claim
 1. 18. Awireless communication system for High-Speed Downlink Packet Access forTime Division Duplex mode, comprising means adapted to perform a methodfor High-Speed Downlink Packet Access for Time Division Duplex mode of awireless communication system according to claim 1.